JPH07670Y2 - Supporting device for additional equipment of flywheel output engine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a support device for an additional device of a flywheel output engine, which drives an additional device such as a generator or a recoil starter by a flywheel, and particularly, the flywheel. The present invention relates to an air-cooled type equipped with a cooling fan.

2. Description of the Related Art A flywheel is provided with a cooling fan, and in an air-cooled engine, the flywheel is covered with a fan case. In this case, in an engine that does not have an additional device such as a generator, the fan case is made of damping material such as damping steel plate, and the vibration of the engine body such as the cylinder block is prevented from being transmitted to this fan case. It is attached to the engine body via a vibration material.

On the other hand, in an engine equipped with an additional device, the fan case needs to be made of a rigid body in order to support the additional device, and the fan case made of this rigid body is directly connected to the engine body without interposing a vibration isolator. Fixed to.

Problems to be Solved by the Invention As described above, in the conventional engine with the additional device, since the fan case is made of a rigid body, it receives more vibration from the engine body than the one made of damping material. In addition, the fan itself is large in size because it is necessary to cool the additional device, and the wind noise generated by the fan is easily transmitted to the outside. Moreover, since this fan case centers the additional device such as a generator and the engine body, it is necessary to fix the fan case accurately through the spigot. Since the vibration from the engine body is directly transmitted, there is a drawback that the sound emitted from the fan case due to the vibration is large. The present invention is intended to eliminate the drawbacks of such a conventional engine with an additional device.

Means for Solving the Problems In order to solve the above problems, in the first invention of this application, a flywheel provided with a cooling fan is covered with a fan case made of a damping material, and the fan case is vibration-proofed. The support member, which is attached to the engine body via the material and supports the additional device such as the generator, is made of a rigid body that is separate from the fan case, and the support member is attached to the fan case outside the fan case. It is characterized by being tightened and fixed to the engine body.

Similarly, in the second invention, in the first invention, the fan case and the supporting member are fixed to the engine body through a plurality of spacers arranged in the circumferential direction of the flywheel, and the spacers are connected to each other. The connection portion covers the gap between the fan case and the engine body.

Operation In the above configuration of the present invention, since the fan case is not made of a rigid body but made of a vibration damping material, the vibration noise of the case and the fan noise are prevented from being transmitted to the outside. Since it is fixed to the engine body via the material, the transmission of vibrations from the engine body is reduced, and the radiated sound of the case itself is further reduced. On the other hand,
Since the addition device is supported by the support member made of a rigid body, it is reliably supported.

Further, in the second invention of this application, since the spacers are connected to each other and the connecting portion covers the gap between the fan case and the engine body, the transmission of the fan sound to the outside is further reduced.

Embodiment FIG. 1 and FIG. 2 show an embodiment implemented according to the first idea of this application. . In FIG. 1, 1 is a cylinder block that constitutes a part of an engine body, 2 is a crankshaft supported by the cylinder block 1, and is provided outside the cylinder block 1 at an end portion of the crankshaft 2. A flywheel 3 is attached.
A cooling fan 4 is integrally formed on the side surface of the flywheel 3. Four cylindrical spacers 5 are provided on the side surface of the cylinder block 1 in the outer diameter direction of the flywheel 3.
Are arranged at intervals in the circumferential direction. A cylindrical sleeve 6 is inserted through the spacer 5 and one end of the sleeve 6 is a bolt hole of the cylinder block 1.
Positioned by plugging into 14 entrances. The mounting hole of the fan case 8 made of a vibration-damping steel plate is externally fitted to the step portion of the outer periphery formed on the end portion on the opposite side of the spacer 5 via the vibration-proof rubber 15, and the fan case thus mounted is mounted. 8 covers the flywheel 3. Reference numeral 9 is a support member for the additional device, which is made of a rigid body such as aluminum casting, and is formed in a donut shape as a whole as shown in FIG.
Protrusions 10 that project in a roughly triangular shape are formed at the locations. Cylindrical bosses 12 having bolt holes 11 in the direction of the crankshaft 2 are integrally formed at the tips of the protrusions 10, and the inner ends of the bolt holes 11 are, as shown in FIG. The spacer 5 is positioned by externally fitting it to the end of the sleeve 6 projecting to the outside of the spacer 5, and the bolt 13 inserted from the outside is inserted through the sleeve 6 and then the end thereof is a bolt hole of the cylinder block 1. The structure is such that the spacer 5 and the support member 9 are fixed to each other by screwing into 14. At that time, the vibration-proof rubber 15 fitted onto the step portion of the spacer 5 is held by the step portion and the end surface of the protrusion 10. As a result, the fan case and the support member are co-fastened to the main body in this order. A screw hole 16 in the direction of the crankshaft 2 is formed in the inner peripheral portion of the support member 9, and the support portion 17 of the generator or the recoil starter is fixed by a bolt 18 screwed into the screw hole 16. In addition, the cooling air for cooling the engine main body is provided in the opening 19 on the inner periphery of the fan case 8.
As a result, after being sucked by the fan 4, it flows toward the engine body in the direction of the arrow in the figure.

3 and 4 show an embodiment implemented according to the second idea of this application. That is, the four spacers 5 arranged in the circumferential direction of the flywheel 3 are connected to the cover-shaped connecting portion.
21 is connected to each other, and the connecting portion 21 is arranged between the outer peripheral end portion of the fan case 8 and the side surface of the engine body, that is, the side surface of the cylinder block 1 to cover the gap between the both 1, 8. This effectively prevents the noise of the cooling fan 4 from being transmitted to the outside.
A gap rubber 22 is sealed between the outer peripheral end of the fan case 8 and the connecting portion 21. Reference numeral 23 in FIG. 4 denotes a connecting plate connecting the spacer 5 and the connecting portion 21.

As described above, according to the present invention, the cooling fan is covered with the case made of the damping material, and the additional device such as the generator is supported by the support member which is separate from the case. Unlike the conventional structure in which the fan case supports the additional device,
This fan case can be vibration-isolated and supported, and the noise generated from the case and the noise of the fan itself can be reduced, and since the support member is a rigid body with high strength, the additional device can be accurately mounted. There is an effect that it can be securely attached.

Further, in the second invention of this application, since the space between the spacer to which the support member is attached and the engine body is covered by the connecting portion that connects the spacers, there is an effect that the noise due to the fan can be further reduced.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part of a flywheel part showing an embodiment of the present invention, FIG. 2 is a side view of a support member and a fan case seen from the right side of FIG. 1, and FIG. Second Embodiment A second embodiment of the present invention is a longitudinal sectional view of a main portion of a flywheel portion, and FIG. 4 is a side view of the supporting member and the flywheel, as viewed from the right side of FIG. DESCRIPTION OF SYMBOLS 1 ... Cylinder block, 3 ... Flywheel, 4 ... Cooling fan, 5 ... Spacer, 8 ... Fan case, 9 ... Supporting member, 18 ... Supporting part of additional device, 21 ... Connecting part

Claims (2)

[Scope of utility model registration request] 1. A flywheel equipped with a cooling fan is covered with a fan case made of a damping material, and the fan case is attached to an engine body via a vibration isolator and supports an additional device such as a generator. Addition of a flywheel output engine, characterized in that the support member is made of a rigid body separate from the fan case, and the support member is fastened together with the fan case on the outside of the fan case and fixed to the engine body. Device support device. 2. A fan case and a supporting member are fixed to an engine body through a plurality of spacers arranged in a flywheel circumferential direction, and the spacers are connected to each other,
The support device for an additional device of a flywheel output engine according to claim 1, wherein a gap between the fan case and the engine body is covered by the connecting portion.